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Fatigue Crack Growth Study and Remaining Life Assessment of High Strength and Ultra High Strength Concrete Beams

Murthy, Ramachandra A and Iyer, Nagesh R and Prasad, Raghu BK (2012) Fatigue Crack Growth Study and Remaining Life Assessment of High Strength and Ultra High Strength Concrete Beams. In: CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES, 89 (6). pp. 459-480.

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Official URL: http://dx.doi.org/10.3970/cmes.2012.089.459

Abstract

This paper presents the details of crack growth study and remaining life assessment of concrete specimens made up of high strength concrete (HSC, HSC1) and ultra high strength concrete (UHSC). Flexural fatigue tests have been conducted on HSC, HSC1 and UHSC beams under constant amplitude loading with a stress ratio of 0.2. It is observed from the studies that (i) the failure patterns of HSC1 and UHSC beams indicate their ductility as the member was intact till the crack propagated up to 90% of the beam depth and (ii) the remaining life decreases with increase of notch depth (iii) the failure of the specimen is influenced by the frequency of loading. A ``Net K'' model has been proposed by using non-linear fracture mechanics principles for crack growth analysis and remaining life prediction. SIF (K) has been computed by using the principle of superposition. SIP due to the cohesive forces applied on the effective crack face inside the process zone has been obtained through Green's function approach by applying bi-linear tension softening relationship to consider the cohesive the stresses acting ahead of the crack tip. Remaining life values have been have been predicted and compared with the corresponding experimental values and observed that they are in good agreement with each other.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the TECH SCIENCE PRESS, USA.
Keywords: Ultra high strength concrete; characterization; fatigue loading; Tension softening; Stress intensity factor; crack growth; remaining life
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Depositing User: Francis Jayakanth
Date Deposited: 15 Apr 2013 11:58
Last Modified: 09 May 2013 11:31
URI: http://eprints.iisc.ac.in/id/eprint/46413

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